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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '28e1e10bda965c131fc2d07d26aec9db3045ce3ecd9cf78cd1ce17331deace2f' 
  AND token = 'vUefX3S1MoSiN8WzIRrYCVk89W7qmotWz3RDwF3UcVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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