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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '13a61e447a79c056abf9aa49b3a01634e17406887a8b3be4bfe90b53d566783b' 
  AND token = '7YtHFDOlE65EZbPJHK07G3QAr1VjMl5dD4jQHR5AnB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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