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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2740885ce2f08e27a689d40f00b5d93b443871afe10771dbd2d03be46595ea7a' 
  AND token = 'wP1BlzZ9P7ZNPAcNFhvxtlhdXjO/MDDkI9ml8QROeBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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