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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2e7b41983121e06ae4b01af67ec2ff12a3e69ea86c37555c30d8b9736b5fc762' 
  AND token = 'CzYLPytxShEy0pXX7ELYa7tueKJaOb1rBgycm7Ii1Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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