SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1f4beaf70092d9f6dca7bffbc21c2a6e05a2416f050a731abec4d7334ad758e9' 
  AND token = 'CnOmHIshSR2nP5KxTFFRHYt9khwIOSz9/WWw+3Oai/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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