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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b2cf431957e2c67153e54b5c83a8a00b23edd23090300691aa8b22ec3ed70b48' 
  AND token = 'lnAM60Nf5zIm/HoUKS9uJisc3g8wNXnF9kNutjYd1k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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