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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '87d823ffa2abe8dff274c2ea55f89e8a7aeb3b1dc2c6afe29eb6b13beb85f266' 
  AND token = 'qoe1BSrOYMK0xttQVKH1lgFOGMuiV0tqOzypf0LZOaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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