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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2665c8d76dc1893ea42de1703c3a2e6131ef85b1856f9e2670b8dceb6417e08a' 
  AND token = 'Byg+qwsW1lT1UxGvsel1G8FikNdGofQDfXQjjiOy9wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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