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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '26e288e3a1136235b0ae3fb5f0ce7c355792392510e62125ea4f31cc3e6df026' 
  AND token = 'MSX6uyUfzWayQcu2dVFYarONjIW7zGTuul3AUxyfP8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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