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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '31a15d8014ff2119444551a19057168a1930132895d600fb786a4395ea649e9d' 
  AND token = 'C5LbFmOTgeaG2qqsodgp+ztolXL3g1qB1U9k0s7O9f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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