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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1ab1a1c0a372ec353c586b29616a50078f83a745d2430e17c071d04b15f19a29' 
  AND token = 'r4OMujVY16xam9gbb8qbed8LEB9WI3mQb/yD+G3jSIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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