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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '723d16e207a385241b9d0fa3ba01e0d3e237f380edf790632a5878343484203b' 
  AND token = 's4Q15/9rJJwz2RVr2iO4O7UNHHPX35w5osLx700NjT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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