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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '443badecd6c6e0084466f7ee1ffafe0727caca155daecda3941e2bd653238e6b' 
  AND token = '9fqwfAicD2URqpzaQWco2WriPDVSAvht9CnN2Yy1xpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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