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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e7a048368254466b7b67544440730dd5293b801549eeb8aa0ff1f28718df9270' 
  AND token = '48Fppvl9KG/578FNfJ1Dynwm7F9Io3F4iMkV17OcSQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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