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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '20de683388b73b77abd962d6662329ebb402be7f012e2c4def5a61fceb518c69' 
  AND token = 'Q9uWR9OQc2WhDSY73KjKtDVWUnNL55FIQZKVW2djbQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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