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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2c2d77f90ad0bdf08803a383d75c846edb39ce69082963a8ef1fd2c4b68b295a' 
  AND token = '+NlbfEHtr6dkVRlrFJ1Mm85vexIdo1CAlN4B1/02vvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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