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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e2b93119bdccc169ee5722634912a0c93c2ac61e70c547d870a4796c5c49998e' 
  AND token = '96T7nma0Rhi+0ST+3ewpk2XTm1P8Uhc9m0J1d/si4xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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