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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dac0516d09d40b37b33f1d8f47062ba4f95efee50b5aa826bf825b09988b7780' 
  AND token = 'Fi7Eft2wD9w65NZ9Bq+f4RtrPbdWUEGoR/EEBO8YPWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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