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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3453337f40fe3a3e3affb0fc52795aad6d76f97cd3e187c37c47742f3d654d7e' 
  AND token = 'SLsmJfnS37mD0e65oxqRiWipL9tKry1DP0KenDDBrgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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