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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e3b6f3dc4773a44ae4abf3ea9cbf0061e804a77078a6bc6f4141e3bd5aed1bb6' 
  AND token = 'o6/JcrFGzv9o26VivcBYN/6ODEJy4GsstTjIEDxU1qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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