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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ca03b28b3e1180187a25d30ebfdb951a70dade2ed961d73d483ccaa19948e0d2' 
  AND token = 'YsMXH6WmWWU5vkJV2RqYM/a7WOteD7ZKzdzMpe7MGXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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