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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '37830bc817e407896003398b6b11eb31c821ccb1bebabf939b3e33c9d52d1077' 
  AND token = 'q16BcZc39lNamP28lALDg9RAH7ylAEN3Mb1RImx24jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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