Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b380456f1e0ad47986a0ab5be52692bbc0c855751a481dd36f8afb0b4c89a7aa' 
  AND token = '/WEQBLjMuGUVVMcLMlIrcoNKGn0Dyll7n5y+DwYDmNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}