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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '986d8d6e01971c0dfd0c41e6643bc8676294f602c2d364efc71ccbeed715bcc4' 
  AND token = 'cSs8ZFV0NbP/CvoYY8WNQdZY+DnklPQ/N9+EVnt2qYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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