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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c330d0a49a9504f36f3d5b5bc08efaf8ff10c0e78841393bbbad98deecca71b8' 
  AND token = 'T3zz6NlGF5yxX0kc951dQnDURcYHgp1wnH8oEnsTHo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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