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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '274552f8582160aa16eeb9e9b808fd45a51b5fb534e568a50574702dc7f3b524' 
  AND token = 'FBta6fobHSu4uyflEgPef3bFEsSJgXw7av35DFXOKOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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