Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e72ec49de43cc9feefe502adbc03bf16367ca6a1a5e4add026f85b66a3f90929' 
  AND token = 'jgB2gEpaHR6iA2XKd0Mk3gWXHNbY0G+euuTMW7JXPx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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