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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c29589ba4eacec22d717a82f7f032e52cee591610f7291b662cadbc6c99e1c4c' 
  AND token = 'yLDhSmW7g/gCafEx4V5JRu1ihmkmuo1VE4OzmkHe4Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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