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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '98cbfffabd71d08f00526bdb8eebc197e6bc69b3029e3a0c9736c37f959f8a1b' 
  AND token = 'JQJHgiSJt4f1bpPApKHTWulFLFIuQlj9OrfIlur/0Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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