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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8804e7e30fddc16151f5c95d5bc788c0908243d1e68c8bd08296b383f67d96d4' 
  AND token = 'eCCfvHK8dopu9RrUHB63PEF3EEMsjIkciCOpFjAZs6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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