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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '131ab76e0401c4abd939b6a467a4128ab89e8db08848fc453a3f599082e9331f' 
  AND token = 'Nj5z0pL/0bISzvkeZbgFIbSYRH6oJx0o1t1RBp5xRng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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