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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '075f418ec23b6fb7e7cbc5d473b4c39e533824eb59a668750a1f2067eb1fc1ac' 
  AND token = 'FDnn+0oAS+Qr7qb9l9sDgN0V8Bem4cli4HIbEsj80/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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