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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7d9b6b428a2d9801f9529a3da0a1757f1a2f93328dcd1d9e7f8903d297383e36' 
  AND token = '5A7zBIPR40Fbjb9u7okftUOY8sFmihtE/UzD1HkZ2uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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