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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd6437c0eab4a9eb6a03f63b2ab7cba4fc50ffdb005e4be6e26ce76c58ef4fcb6' 
  AND token = 'H8nyLOE83Ym3WqT4XAttNC9MRIN0qf4t8q2R3RM+2t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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