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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1ef585bf43a6420468accb9d1e886cf9b3cfc184685b606554ebba9a3a220cc1' 
  AND token = 'dNbSjooPJWsIa8cQQpGlk1UKJEqE1la7YdVgxBH5iR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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