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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd4a7105bb184631c7b0ad989e1145fd1e801e712d82a31234c41029aa4f4dbc1' 
  AND token = 'Sxsm753bfs+slIeSOlEJVYQB3iqiNadB3oKvroAKXBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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