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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b7471c9780e268569e7c3b778db5873d2296ad6afd2bc13a45e76c7fe10f9724' 
  AND token = 'i+8uxCltRlcv3lAntfNAaEAmA7Pdea1o7JtAqn538UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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