SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0f70f601ec73adce58fe1bc98319a02a1f6ea0506e2dc5f2760f5c6ad8d347c3' 
  AND token = '2aTV3BxFZbVRebqzth1EuBIhXX48Mjx4qLHisjPmzWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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