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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '92a2f6d391958eaa4cecfe2d0ad3d0cb7e8c56e759c212a8dd86c4eb585d6e00' 
  AND token = 'u+In7ZE+Zk1qsZ0IFtvWJ/YgVVDrDgYEUI4fbd/JtdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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