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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8ace41043155d2868a9e97f728f19a5cd45fd260d8118f2ac463f07fb88edef9' 
  AND token = 'fyNGTIDZCUb0kYFk0o/rvoY8ZcWfrx15Ahg6US1uI3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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