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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d551e28917d827b9dece3fb0f587ea5e1d58f57e12665eb9d5ccd672ad3edfa' 
  AND token = 'TjP4eItuw/f+LBuzTClAPD7wDhK8+VTfuxfSwoiQqUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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