Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b3e8a21cab29af76a2e9ae2e93e5d077663a0034d942f2466477eef190ee3e' 
  AND token = 'aL0Rme0XsPBT6UPThTX7FhJB+WUb1s7qi2+Ui39ydAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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