Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c981dcad3a08b1af4b829da3b3f65a1f877358f2ba229dc7be09c8420b51b9' 
  AND token = 't1yeQsVb/UQgjy+Mu+eaugXD+LmJaDc812oGCPMARzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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