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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a5cf3798f727930733060594bafcdba117b828e56a8d8a52c4ae25ee4bcdf99e' 
  AND token = '475ljX5lTkXFaXkCakoW/QjgKT48ZDW2//T0NDNPRqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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