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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'de2e8356e71bc2a0134c8ab3b8ed4bd67eb7d454856623cf2371c6adcc2a87e4' 
  AND token = 'LVhJEuk4ej8Kyc/qKWXSNC87ckZoiNBuT9q/TIx4OwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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